AMBE2000 Datasheet, PDF (12/47 Pages) List of Unclassifed Manufacturers – VOCODER CHIP

AMBE-2000™ Vocoder Chip
User’s Manual Version 3.0
Pin Number Pin Descriptive Name Pin Direction Notes
41
CODEC_TX_DATA
27
CODEC_RX_CLK
33
CODEC_TX_CLK
51
CLOCK_MODE
8,11,12,23
36,39,44,45
46, 47,48
49,54,57,64
76,87,90
1,9,10,25,26
35,40,50,52
53,56,63,65
88,89
2,3,4,5,6,7,
13,14,15,16
17,18,19,21
22,24,43,55
58,59,60,61
62,66,91,92
93,94,95,96
97,98,99
100
VDD
GND
No Connection
Output
Input
Input
Input
PCM Data from AMBE-2000 to D/A Conveter
A/D Serial clock. Should be connected to CODEC_TX_CLK
D/A Serial clock Should be connected to CODEC_RX_CLK
If high enables crystal oscillator option for clock source. If low then external oscillator
option is selected. See Section 3.4 for details.
Power
Supply Voltage
Power
Ground
These pins must remain unconnected
Note 1:The AMBE-2000 expects an encoder packet to be read approximately every 20 msec. Following the initial
reset, wait for EPR to go low and read the initial packet (t0). 20 msec later, the next packet (t1) should be ready.
For packet t1 and all following packets use the procedure below:
1) Wait for slightly less than 20 msec.
2) Assert CHAN_TX_STB and read word on CHAN_TX_DATA.
3) If transmitted word not 0x13EC, discard it and repeat step 2.
4) If transmitted word 0x13EC, read 23 more words (rest of packet).
A new packet should be ready every 20 msec after the initial EPR high to low transition. A packet read should take
place every 20 msec. If there is a delay in the read (i.e. a packet is missed), it is recommended that the device be
reset.
page 12
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